Fixed the headings for Changes to your code table

docs/content/guide/$location.ngdoc

@@ -770,11 +770,13 @@ then uses the information it obtains to compose hashbang URLs (such as
       <td>$location.search(search)</td>
     </tr>
 
+  <thead>
     <tr class="head">
-      <td>Navigation outside the app</td>
-      <td>Use lower level API</td>
+      <th>Navigation outside the app</th>
+      <th>Use lower level API</th>
     </tr>
-
+  </thead>
+
     <tr>
       <td>$location.href = value<br />$location.update(value)</td>
       <td>$window.location.href = value</td>
@@ -785,11 +787,13 @@ then uses the information it obtains to compose hashbang URLs (such as
       <td>$window.location[protocol | host | port | path | search]</td>
     </tr>
 
+  <thead>
     <tr class="head">
-      <td>Read access</td>
-      <td>Change to</td>
+      <th>Read access</th>
+      <th>Change to</th>
     </tr>
-
+  </thead>
+
     <tr>
       <td>$location.hashPath</td>
       <td>$location.path()</td>